(In Lieu of Raincaps)
Semi-circular flaps (butterfly damper) cover the exhaust stack when fan is off. When the fan is on, flaps are forced out of the way to provide a clear path for air movement. A built-in gutter system is designed to prevent rain and snow from entering stack. Made from galvanized spiral pipe for strength and durability; available in most sizes. Preassembled for immediate installation.
*Fabricated from Hammerlock pipe.